DE29623535U1 - Lifting device for seating or lying surfaces - Google Patents

Description

Be &bgr; honor exercise

Lifting device for seating or lying areas

The invention relates to a device for raising the seating or lying surfaces, in particular of seating or lying furniture in the area of home care. Particularly in the case of so-called nursing beds, there is a requirement to raise the lying surface to a position that makes care easier.

There are special hospital beds or patient tables where the bed is arranged on a hydraulically driven, telescopically extendable column. There are also known solutions where the bed can be adjusted in height using vertical spindles. These solutions are not very suitable for retrofitting to existing bed frames due to their high costs and the relatively large height when retracted.

Particularly when used in a normal bedroom bed frame, it is necessary that the lifting device does not protrude beyond the bed frame when retracted. For this purpose, it is known to use powered scissor lever systems that can be retracted sufficiently flat. Such lifting devices are known from DE 43 20 092 Al and WO 94/20405, among others. The disadvantage of these designs is that the upper and lower ends of the scissor levers, and thus the actual bearing points, have to perform a horizontal movement, which means that they are more or less far apart from each other depending on the lifting height, which has a detrimental effect on the stability.

EP 576 924 A1 describes a mobile hospital or care bed in which a certain height adjustment is possible by extending the wheels. A motor-driven pair of knee levers is provided for this purpose. The vertical guide

is carried out via a height-adjustable telescopic guide mounted on each wheel. However, with this solution, the telescopic guides have to absorb enormous lateral forces. This solution is not suitable for use in a normal bed conversion.

Another known lifting device, which can be used in normal bed frames in particular as a bed lifter, has a lower and an upper frame, on whose side beams four-bar joints are arranged in pairs and can be adjusted using a spindle motor. The stability is ensured by a rod-shaped guide element on which joint-bearing bushings slide. The disadvantage of this solution is that the bushings sliding on the guide elements have to absorb enormous radial forces. This solution therefore requires high drive forces and is prone to premature signs of wear.

The object of the invention is to create a lifting device for seating or lying surfaces which can be used in normal bed frames, has a simple mechanical structure and a high level of stability, whereby longitudinally displaceable bearing components can be dispensed with on the actual lever mechanism.

This object is achieved by a lifting device having the features of patent claim 1.

The advantages achieved with the invention are in particular that the lifting device can be manufactured very cost-effectively by using structurally simple components. Since the horizontal distance between the joints is the same at every lifting height, a consistently high level of stability is also guaranteed. All movable bearing points are designed as pivot bearings, so that no sliding guides susceptible to wear are necessary.

Advantageous embodiments of the invention are specified in the subclaims.

An embodiment of the invention is shown in the drawings and is described in more detail below.

Show it:

Fig. 1 a front view

Fig. 2 a top view

In Fig. 2, the reference numerals for the parts not visible in Fig. 1 are each marked with apostrophes.

The lifting device according to the invention has a lower frame 2 and an upper frame 1. Both frames consist of welded longitudinal and transverse beams. The lifting device can be placed on the floor with the lower frame 2 inside a bed frame. Due to the compact, flat design, however, it is preferably possible to hang the lifting device directly into an existing bed conversion. The actual lying surface in the form of a known mattress frame is placed on the upper frame 1.

The levers 6; 6' and 8; 8' are pivotally mounted on the lower longitudinal beams in the area of their lower ends, while the levers 6 and 8 as well as 6' and 8' are each articulated at their upper ends by the struts 10 and 10' respectively. The levers 5; 5' and 7; T are mounted on the same joint axes in the area of their lower ends. Analogous to the lower frame 2, the levers 5; 5' and 7; T are pivotally mounted at their upper ends on the longitudinal beams 3; 3' of the upper frame 1. The levers 6; 6' are coupled to the levers 7, 7' by the struts 9; 9' respectively. The struts 9;

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9' are directly pivotally connected to the levers 6; 6' with their left ends, while the right ends are pivotally connected to tabs 14; 14' protruding from the levers 7; 7'. This means that these pivot points of the struts 9; 9' are not on the longitudinal axis of the levers 7; 7'. This ensures that the height adjustment of the upper frame 1 is parallel and congruent with the lower frame.

To introduce a driving force, a crossbar 12 is rigidly arranged between the longitudinal beams 4 and 4' of the lower frame 2 and a crossbar 13 is rigidly arranged between the levers 7 and 7'. The spindle 16 is hinged to the crossbar 12 and the motor block of the spindle motor 15 is hinged to the crossbar 13. To additionally stabilize the entire lever system, the levers 5 and 5' are rigidly connected by a stabilizing crossbar 11.

When retracted, the lifting device has a very low height. This means that the lifting device can be used advantageously in existing bed frames. To raise it, the spindle motor 15 transfers its power to the lever system. The bed surface is raised without horizontal movement of the upper frame 1 and the swivel joints connecting the levers to the frames 1 and 2.

In embodiments not shown, a cross member 13 that introduces the driving force into the lever system can also be arranged between the struts 9 and 9' or 10 and 10'.

Claims (5)

Patent claims !.Lifting device for sitting or lying surfaces, with a lower frame and an upper frame that is adjustable in height and supports the sitting or lying surface, both frames being connected to one another via drivable pivot levers, characterized in that levers (6; 6') and (8; 8') are mounted in swivel joints on the longitudinal beams (4; 4') of the lower frame (2) in the area of their lower ends, that the levers (6; 6') are connected to the levers (8; 8') in the area of their upper ends by swivel joints with struts (10; 10'), that the lower ends of levers (5, 5') and (7; 7') are also mounted in swivel joints on the same axes of these swivel joints, and that the levers (5, 5') and (7; 7') are mounted in swivel joints on the upper frame (1) in the area of their upper ends, and that the two lower levers (6, 6') are each pivotally coupled to the upper levers (7; 7') via the struts (9; 9'), the struts (9; 9') being hinged to tabs (14; 14') projecting from the levers (7; 7'). 2. Lifting device according to claim 1, characterized in that the longitudinal beams (4) and (4') of the lower frame (2) are rigidly connected by a cross member (12), and that the levers (7) and (7') are rigidly connected by a cross member (13), a spindle motor (15) with spindle (16) being arranged in a pivotable manner between the cross members (12) and (13). 3. Lifting device according to claim 1, characterized in that the longitudinal beams (4) and (4') of the lower frame (2) are rigidly connected by a cross member (12), and that the struts (9) and (9') are rigidly connected by a cross member (13), with a spindle motor (15) with spindle (16) being arranged in a pivotable manner between the cross members (12) and (13). 4. Lifting device according to claim 1, characterized in that the longitudinal beams (4) and (4') of the lower frame (2) are rigidly connected by a cross member (12), and that the struts (10) and (10') are rigidly connected by a cross member (13), with a spindle motor (15) with spindle (16) being arranged in a pivotable manner between the cross members (12) and (13). 5. Lifting device according to one of claims 1 to 4, characterized in that at least the levers (5) and (5') are rigidly connected by a stabilizing cross member (11).